Full Review ⭐ Qimu Cordless Impact Wrench: 1/2 inch Chuck Driver Brushless Impact Gun, 21V Power Electric Wrench/Max Torque (420N.m), 2300 RPM Impact Drill with 6.0Ah Li-ion Battery&Charger, 4Pcs Driver Impact Sockets

Impact wrenches are powerful cordless tools designed to deliver high torque for driving and loosening fasteners. They utilize compressed air or electric motors to generate rotational impacts that can tighten or loosen stubborn bolts and nuts. The Qimu Cordless Impact Wrench is an electric impact driver that runs on a powerful 21V lithium-ion battery.

Qimu is a relatively new brand but they've made a name for themselves by offering affordable power tools that rival premium brands in performance. The Qimu 1/2" impact wrench is their flagship model, designed for automotive and industrial use. It features a brushless motor for efficiency, long runtime, and durability. With 420 Nm of max torque, it packs serious power in a compact 6.7 pound body.

This review will take a close look at the key features and performance of the Qimu impact wrench to see how it stacks up for DIYers and professionals. We'll examine the power, runtime, chuck, controls, accessories, and overall value offered at this price point.

Design & Build Quality

The Qimu Cordless Impact Wrench features an ergonomic and lightweight design for comfortable use. The housing is constructed from durable composite materials that are impact-resistant. Despite the powerful motor, the tool only weighs 2.9kg making it easy to maneuver and reducing fatigue during prolonged use.

The handle has a rubberized soft grip that provides a secure hold even with greasy or wet hands. The grip contour fits nicely in the palm for optimal control. An adjustable side handle can also be mounted for even better stability when using higher torque settings.

Overall, the wrench is thoughtfully designed for the tough conditions of automotive repair. The composite housing can withstand bumps and drops without damage. The lightweight build paired with the ergonomic grip makes this a comfortable impact wrench suitable for extended jobs.

When looking for a high-quality cordless impact wrench, the Qimu 21V Cordless Impact Wrench is an excellent option to consider. This 1/2" brushless impact gun delivers an impressive max torque of 420 N.m, providing all the power needed for automotive repair jobs. The 3-in-1 design allows it to drive, loosen, and remove even the most stubborn bolts and nuts.

This cordless impact wrench comes as a complete drill set, including a 6.0Ah lithium-ion battery and fast charger. With the high capacity battery, you can expect extended runtime before needing to recharge. Four impact sockets are also included to get you started. Everything comes in a durable case for storage and portability.

When shopping for an impact wrench, power and torque capabilities are important factors. But the design and ergonomics also play a key role in performance and preventing fatigue. This model from Qimu checks all the boxes with its lightweight but durable construction and comfortable soft grip handle. If you're a mechanic or DIYer needing a reliable high torque cordless impact wrench, the Qimu 21V is an excellent choice worth considering.

With 420 N.m of max torque, a 6.0Ah battery, included sockets, and a carrying case, this cordless impact wrench set has everything you need. The brushless motor provides efficient power transfer for the best combination of performance and runtime. Given the durable and ergonomic design, the Qimu 21V is built to provide reliable service for automotive repair jobs and projects requiring high torque.

Motor & Power

The Qimu impact wrench is powered by a brushless motor, which provides several advantages over brushed motors. Brushless motors are more efficient, generate less heat, have a longer lifespan, and require less maintenance since there are no brushes to wear out over time.

This impact wrench delivers an impressive 420 Nm of maximum torque, which is more than enough for most automotive and DIY projects. The torque output combined with a variable speed trigger allows you to match the power to the application. For lug nuts and other stubborn fasteners, you can start off with maximum torque then back down as it breaks loose.

With a no-load speed of 0-2300 RPM, the Qimu can zip through fasteners quickly when full power isn't needed. The brushless motor helps maintain the top speed while under load compared to brushed motors.

Runtime is excellent thanks to the efficient brushless motor and large 6.0Ah battery. You can expect to drive hundreds of lug nuts or lag bolts on a single charge. The battery indicator lets you monitor remaining runtime to avoid unexpectedly running out of juice mid-project.

Overall, the Qimu impact wrench provides professional power and performance for automotive and home DIY use. The brushless motor technology delivers impressive torque, speed, and runtime while being durable and low maintenance.

Battery & Charger

The Qimu impact wrench comes with a powerful 6.0Ah lithium-ion battery. Lithium-ion batteries are known for their high energy density and low self-discharge, making them well-suited for power tools.

The large 6.0Ah capacity provides ample runtime for most applications. On a full charge, users can expect around 300-400 bolts removed or tightened before needing to recharge. This high capacity battery allows you to work longer between charges.

Charging the battery is straightforward with the included charger. It fully charges the battery pack in about 60-90 minutes. The charger plugs into a standard wall outlet and has an LED indicator to show charge status.

One downside is that only a single battery is included. Some users may want to invest in a second battery for continuous work by having one on the charger while using the other. But the fast recharge time helps minimize downtime.

Overall, the large capacity lithium-ion battery and fast charger make this impact wrench convenient for extended use. The battery tech and size provide powerful, lasting performance.

Chuck & Anvil

The Qimu impact wrench features a 1/2 inch chuck, which is a common size for medium and heavy duty impact wrench applications. This allows it to accept 1/2 inch impact rated sockets.

The chuck has a spring loaded ball detent design that provides solid socket retention while also making it easy to change sockets quickly. There is no need for a chuck key or any tools to change sockets.

The anvil is a hog ring type. This has slots that sockets attach to with a hog ring clip. Hog ring anvils provide a very secure socket connection that can withstand the high torque reaction forces from impacting. They also allow for quick and easy socket changes.

With the 1/2 inch chuck and hog ring anvil, the Qimu impact wrench is compatible with all standard 1/2 inch drive impact sockets, both 6-point and 12-point varieties. This gives you a wide range of socket options for accessing various bolt and nut sizes.

Impact Mechanism

The Qimu impact wrench uses a hammer and anvil impact mechanism to generate high torque. This type of mechanism uses two components - a spinning mass called the hammer, and a stationary anvil.

As the motor spins, it rotates the hammer. When the hammer spins fast enough, its momentum causes it to strike the anvil, creating an impact force. This impact force is transferred to the bolt/nut, providing a sudden high torque to loosen or tighten it.

The hammer and anvil design is simple yet effective for cordless impact drivers. It allows them to deliver much higher torque compared to regular drills, while minimizing reaction forces back to the user. The hammering action can also help break loose stubborn, rusted, or over-tightened fasteners.

Overall, the rotating hammer and stationary anvil system gives the Qimu impact wrench its hard-hitting, high torque output in a compact cordless tool. This makes it ideal for automotive repair, construction jobs, and heavy-duty fastening applications.

Controls

The Qimu impact wrench has intuitive and easy to use controls. The power switch is conveniently located for one-handed operation. Simply press the trigger switch to turn the tool on or off.

There are 3 speed settings - 1, 2, and 3, with 3 being the highest speed. The settings allow you to match the power and speed to the task at hand. For high torque fastening, use speed 1. For removing bolts, use speed 2 or 3 for extra power.

The forward/reverse control switch makes it easy to change directions without changing grip. Press the switch left for forward rotation and right for reverse. This comes in handy when removing stubborn bolts or fasteners.

The variable speed trigger provides precise control over the speed and power. Squeeze lightly for lower speeds and more gently for higher speeds. This allows you to start slowly to prevent damage to fasteners or workpieces. The sensitive trigger gives you complete control over the impact wrench.

Overall, the controls are thoughtfully designed for convenience and to give users complete command over this powerful impact wrench. The intuitive switches, speed settings, and variable trigger offer precision control for any fastening task.

Accessories

The Qimu impact wrench comes with several useful accessories right in the box. This makes it ready to tackle jobs as soon as you open it up.

Included Sockets

It includes 4 impact sockets - 17mm, 19mm, 21mm and 23mm. These cover many common bolt and nut sizes for automotive and machinery work. The sockets lock securely onto the anvil thanks to the detent pin design.

Extensions

To help you reach fasteners in tight spots, a 5 inch extension piece is included. Made of durable chrome vanadium steel, it allows you to gain the extra reach when needed.

Adapter

For versatility, a 1/2" to 3/8" adapter is included in the kit. This lets you use standard 3/8" drive impact sockets with the 1/2" impact wrench. Very handy for anyone with existing 3/8" socket sets.

Case

The impact wrench, batteries, charger and all accessories come packed in a durable blow molded case. This keeps everything protected while in storage and transport. The customizable foam insert securely holds each piece in place.

Pros & Cons

Pros

• Powerful motor delivers up to 420 Nm of max torque for driving and removing the toughest bolts and fasteners
• Brushless motor is efficient, runs cooler, and requires less maintenance than brushed motors
• Compact and lightweight design increases maneuverability in tight spaces
• LED light illuminates work area
• Variable speed trigger offers control and precision
• Includes battery fuel gauge to monitor remaining runtime
• Charger features fast charging to minimize downtime
• Backed by 2-year warranty for peace of mind

Cons

• Battery and charger are sold separately, adding to initial cost
• Chuck only accepts 1/2" hex shank bits and sockets, limiting versatility
• Lacks protective rubber overmolding on the grip and body
• May be too powerful for light-duty tasks, with no lower torque settings
• Does not include a belt clip or holster for convenient storage

Verdict

The Qimu Cordless Impact Wrench is a powerful and versatile impact driver that will make a great addition to any DIYer or professional's toolkit. Its compact and lightweight design makes it easy to handle, while still packing a serious 420 Nm of maximum torque from its efficient brushless motor.

The included 2x 3.0Ah batteries deliver ample runtime for most projects, and the rapid charger has you back up and running in under an hour. The 1/2" anvil chuck provides versatility to drive a wide range of sockets and accessories. An LED light and belt clip add convenience.

Overall, the Qimu impact wrench hits a sweet spot between power and portability. For most automotive and construction tasks, it has all the torque needed in a compact format that won't wear you out. The 3 year warranty provides peace of mind on a tool built to last. If you're looking for an affordable cordless impact wrench that can handle tough jobs without the heft, the Qimu is an excellent choice. It will quickly become your go-to for all sorts of DIY projects and professional use.